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Radon Levels in Juneau City and Borough, Alaska

EPA puts Juneau City and Borough in Zone 3, its lowest radon zone, and only 8 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Nearest county

    3.1%

    Anchorage Municipality, 552 miles

    Anchorage Municipality
    3.1%
    Alaska
    11.5%

    Share at 4+ pCi/L, 130 tests, 2022

  • Ground above low

    94.7%

    15.4 pts above Alaska

    Juneau City and Borough
    94.7%
    Alaska
    79.2%

    Share of land USGS rates moderate or high potential

  • Tests reported

    8

    Too few for a share

    Juneau City and Borough
    8
    Needed
    30

    2022

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

Read a result for Juneau City and Borough

Starts at EPA's action level

4.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.0 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Juneau City and Borough, At a glance

Juneau City and Borough at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Juneau City and Borough as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Moderate across 95% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Juneau City and Borough, 2022

Share of reported tests at or above 4 pCi/L, by year, Juneau City and Borough
Share of reported tests at or above 4 pCi/L, by year, Juneau City and Borough
YearShare of reported tests at or above 4 pCi/L
20140.0%
20150.0%
20200.0%
202125.0%
20220.0%

2022: 0.0%. Across these years the share ran from 0.0% to 25.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 8 tests were reported to CDC for Juneau City and Borough over 2022, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the borough or census area nor this house.

Measured: CDC tracking data. Figure above: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).

How to read these figures

Juneau City and Borough, Compared

Juneau City and Borough radon figures, compared

Calculated by Radon411

CDC's largest figure for Juneau City and Borough rests on 8 tests in 2022, 0 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 0.6 pCi/L, with a middle value of 0.1 pCi/L.

The nearest counties with a figure are Anchorage Municipality (552 miles away) at 3.1%, Matanuska-Susitna Borough (590 miles away) at 14.3% and Fairbanks North Star Borough (598 miles away) at 19.4%. Pooled across 19 Alaska counties, 11.5% of reported tests reached that level; across every county in the country with a figure, 23.9%.

Statewide for the same period, Fairbanks North Star Borough reported the highest share (19.4%) and Anchorage Municipality the lowest (3.1%). EPA's 1993 map puts Juneau City and Borough in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 95% of the county's land moderate radon potential.

Alaska, the United States and the counties around Juneau City and Borough, 2022
AreaTestsAt or above 4 pCi/LMedian
Alaska, pooled19 counties, pooled31411.5%Not pooled
United States, pooled853 counties, pooled333,14023.9%Not pooled
Fairbanks North Star Boroughhighest in the state7219.4%1.4 pCi/L
Anchorage Municipalitylowest in the state1303.1%0.5 pCi/L
Haines Borough, AKborders it1100.0%19.7 pCi/L
Hoonah-Angoon Census Area, AKborders it10.0%0.4 pCi/L
The nearest Alaska counties to Juneau City and Borough with 30 or more tests, 2022
CountyDistanceTestsAt or above 4 pCi/LMedian
Anchorage Municipality552 mi1303.1%0.5 pCi/L
Matanuska-Susitna Borough590 mi4214.3%1.1 pCi/L
Fairbanks North Star Borough598 mi7219.4%1.4 pCi/L
Juneau City and Borough radon tests by year, against Alaska's pooled share
YearTestsAt or above 4 pCi/LMedianHighestAlaska, pooledChange from the row before
202280.0%0.1 pCi/L0.6 pCi/L11.5%−25.0 points
2021425.0%0.4 pCi/L4.5 pCi/L18.8%+25.0 points
202020.0%0.2 pCi/L0.2 pCi/L15.9%Level
201510.0%1.0 pCi/L1.0 pCi/L27.1%Level
201420.0%0.2 pCi/L0.2 pCi/L28.1%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Juneau City and Borough, Geology

The ground under Juneau City and Borough

Predicted

USGS's geologic map puts all of Juneau City and Borough's mapped land in one class: moderate radon potential. 94.7% of it lies in the area the map calls Coast Mountains, to which USGS gives a radon index of 9, in the moderate band (9 to 11).

USGS's geologic areas under Juneau City and Borough
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Coast MountainsUltramafic through felsic intrusives, Mesozoic mafic volcanic rocks, Mesozoic and Paleozoic sedimentary rocks, schist, gneiss, marble, amphibolite, pelite.Moderate994.7%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Juneau City and Borough beside the ground around it

Juneau City and Borough has more moderate-potential ground than Alaska as a whole: 94.7% of its land against 79.2%. Of the 2 boroughs and census areas that border it, none has as large a share of moderate-potential ground; Haines Borough comes nearest at 38.2%.

Share of land by USGS radon potential: Juneau City and Borough, the 2 boroughs and census areas bordering it and Alaska
AreaEPA zoneLow potentialModerate potentialHigh potential
Juneau City and BoroughZone 3None94.7%None
Haines BoroughZone 360.0%38.2%None
Hoonah-Angoon Census AreaNot published63.3%29.7%None
Alaska29 boroughs and census areas, pooled by land areaVaries19.2%79.2%None

The map rates the ground, not the air in any home.

Local help

Juneau City and Borough, Local resources

Radon testing and mitigation in Juneau City and Borough

What Alaska's program says
Phone
907-269-6401
Email
paul.goodfellow@alaska.gov

What it means

Juneau City and Borough, Questions

Questions about radon in Juneau City and Borough

Are radon levels high in Juneau City and Borough?

In 2022, 0.0% of the radon tests reported to CDC for Juneau City and Borough, Alaska were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.1 pCi/L. Of the 3 nearest counties with a figure, within 598 miles, the share of tests at or above 4 pCi/L runs from 3.1% to 19.4%.

Which counties border Juneau City and Borough?

Juneau City and Borough borders 2 boroughs and census areas: Haines Borough and Hoonah-Angoon Census Area.

Products

Juneau City and Borough, Products

Testing a home in Juneau City and Borough

No CDC figure names Juneau City and Borough; the nearest county with one, Anchorage Municipality (552 miles away), reported 3.1% of its tests at or above 4 pCi/L in 2022, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Juneau City and Borough.

Test kits and monitors3

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Best radon monitors for Juneau City and Borough homes, compared

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Juneau City and Borough, Bordering boroughs and census areas

Boroughs and census areas bordering Juneau City and Borough

Calculated by Radon411

Juneau City and Borough, Cities and towns

Cities and towns in Juneau City and Borough

About 31,609 people live in Juneau City and Borough by the Census Bureau's estimate for July 1, 2025, 595 fewer than in 2020 (−1.8%). That works out to 12 people per square mile of land. Juneau, its one incorporated place, has 31,609 residents, 100.0% of the total. Reported testing is thin here: 8 tests over 2022, or 0.3 for every 1,000 residents (2025 estimate), where Alaska as a whole comes to 0.4.

Juneau is the one incorporated place here; CDC publishes no figure by town, so it reads Juneau City and Borough's.

Juneau, Juneau City and Borough: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Juneau31,609−1.8%100.0%

One incorporated place, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Juneau City and Borough, Homes

Homes in Juneau City and Borough

Fewer than six in ten of Juneau City and Borough's 14,170 homes are detached houses (47%, against 63% across Alaska); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1981, close to Alaska's 1985: 13% date from before 1960 and 17% from 2000 or later. 64% of occupied homes are lived in by their owner (Alaska: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Juneau City and Borough, Alaska, 2019 to 2023
HomesJuneau City and BoroughAlaska
Housing units14,170327,610
Detached houses47%63%
In buildings of 5 or more20%12%
Mobile homes8%4%
Built before 196013%8%
Built since 200017%25%
Middle year built19811985
Owner-occupied64%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.